Collapsible winding shaft



June 23, 1931.

F. E. LANGDON COLLAPSIBLE WINDING SHAFT Filed Feb. 10 1930 @xiv 1 NLNRllPatented June 23, 1931 UNITED STATES FRANK E. VIAAIQTDOhT, F VANCOUVER,WASHINGTON COLLAPSlBLE W'INDING SHAFT Application filed February 10,'1930. Serial No. `427,141. y

an increased length of paper supporting areaY as compared with the shaftdescribed in my United States Patent Number 1,631,538.

The second obj ect is to provide an improved form of lock for theexpansible sides of the Y shaft.

These, and other objects, will become more apparent from thespecification following as illustrated in the accompanying drawings, in

which:

Figure 1 is a longitudinal lsection through the outer plates showing theremainderof the shaft in elevation.

Figure 2 is a section taken along the line 2 2 in Figure 1. Y

Figure 3 is a fragmentary view showing the locking pin removed for thepurposeiof taking the shaft apart.

Y v-I `igure 4 is a section taken along the line 4 4 in Figure 1.

Figure 5 is a section taken along the line 3 5 5 in Figure 1. v

Figure 6 is a section taken along the line 6 6 in Figure 1. v n

Figure 7 is a section through an expanded i aw end.

,35 Similar numbers of reference refer to simiwithin the sleeve 10.- Theshank 11 is alsov provided with a stub end 14 which fits closely intothe interior of the sleeve 10. Around the same end of the sleeve 10 towhich is secured the shank 11 is fastened a collar 15 provided with anundercut sloping face 16 on the side away from the shank 1l. The collar15 is secured to the sleeve 10 by means ofthe set screw. 17. y

Along the length of the sleeve 10 are formed the flattened faces 18 and19 through which pass the keyhole slots 20 whose enlarged end 55 21 lieswithin the flattened area 18. Thelats tened face 19 is somewhat raisedwith relation to theface 18, the connecting surface 22 forming anincline.

In the opposite end of the sleeve 10` is in- 60 serted a plug `23provided near its middle with a shoulder 24 which engages the end of thesleeve 10. The plug l23 is secured to the Y, sleeve 10 by means of thescrew 25.

Rotatably mounted on the plug 23 outside 65 of its shoulder 24 is acollar 26 whose portion 27 is reduced to the outside diameter'of thesleeve 10.. v.The plug 23 is provided with a bar slot 28, and the collar26 is provided with the corresponding slots 29. A bar. 30 is 70 pushedthrough the slots- 28 andi-29 for the purpose of retracting the expansible members about to be described tothe position shown in Figure 2,namely that in `which the plug is withdrawn from the roll 31. The plug23 is 75 also provided with a shank 32 similar to the shank 11 and forthe same purpose. Y The collar 26 is provided with the end slots 33through which extends a pin 34 which; in turn, passes through the plug23.

The function of the slots 33 and the pin 34 is to permit a limitedylongitudinal movement between'the plug 23 and the collar 26. The collar26 is of the same external diameter as is the collar 15. Y

1 Surrounding the sleeve 10 are three arcu-v ate jaws 35 whose ends 36are tapered to correspond with'the face 16. Against the concave sideof'each jaw 35 is secured a cam 37' by means of the double headed rivet38 whose innermost head 39can pass freely along a slot 20 and Vwhoseoutermost head 40 is sufficiently small to permit same to pass throughthe opening 21. 95

Within the sleeve 10 are the washers 41 and 42 between which isstretched a spring 43 whose ends are attached to the ywashers 41 'and 42by means of the eye bolts`44. The washer 4l. bears against the pins 45in the 10o sleeve 10. The washer 42 bears against the head 40 of therivet 38.

rlhe plug 23 is provided with elongated slots 46 to accommodate itsrespective rivets 38. The end of each jaw nearest the collar 26 hassecured on the inner side a double headed rivet 47 whose head 48 passesfreely through a transverse keyhole slot 49 into `the reduced portion 27of the collar 26, and the head 50 of the rivet 47 can pass through theenlarged portion of the keyhole slot 49.

The operation of the device is as follows: To assemble same it isnecessary to place .the three jaws 35 in position around the sleeve 10allowing the rivet head to -pass through the openings 21 and thensliding the jaw longitudinally toward the collar 15, in which positionthey are prevented from separating from the sleeve 10, and one endthereof is securely held against outward movement by the collar l5.lVhen placing the various jaws in position each rivet head is passedthrough its respective opening in the collar portion 27. The washers 4land 42, together with the spring 43, are of course also placed inposition.`

The next movement .is to rotate the collar 26 with relation to the plug23 until the pin 34 can be inserted as shown in Fig. l) Y This partialrotation of thecollar 26 has brought the keyhole slot 49 and the rivetportion 48 into the relation shown in Fig. 1f It can Vbe seen that aslong as the pin 34 is in place that it will `vb e impossible to removeany of the jaws 35, nor is it necessary that they should be removedexcept forrepairs, in which event it is necessary to first remove thepin 34.

By this construction I have not only overcome the diiiioulty ofassembling and taking apart the winding shaft described in my previouslymentioned patent, lbut I have also increasedthe length of its expansibleyportion `and simplified the construction thereof.

I claim:

l. A collapsible winding shaft having in combination a tubular core, aplurality of arcuate jaws surrounding said core and slidably mountedthereon, wedge ,means between said jaws and core for moving said jawsradially as they slide longitudinally, spring means for urging said jawsto an eX- panded position, a. slidable collar attached to all of saidjaws having means for exerting a `leverage between same and said tubularcore, said slidable collar being normally nonnal keyhole slots formed inthe surface thereof, a plurality of arcuate jaws having inwardlyprojecting double headed rivets occupying said keyhole slots, one headof each rivet passing slidably in the small portion of said slot and theother head passing freely through the enlarged portion of the slot, eachof said jaws having an inwardly projecting rivet secured to one endthereof, a collar normally slidably attached to said tubular core, saidcollar having a plurality of keyhole slots formed around the peripherythereof nor nal to said tube, slots adapted to receive the end rivets ofthe jaws, and a pin for slidably and nonrotatably uniting said tube andcollar whereby when said pin is withdrawn said collar is free to rotatewith relation to said jaws in a manner that the jaws may be movedradially away from said core.

3. In a collapsible winding shaft the combination of an elongatedcentral core having an undercut collar at one end thereof, a pluralityof stepped cam surfaces formed along the sides thereof, each of saidsurfaces having a keyhole slot formed therein longitudinal with saidcore, a plurality .of longitudinal arcuate jaws surrounding said core,each of said jaws having a number of double headed rivets mounted on theinner side thereof one head of said .rivet being passable .2

rivets constituting a means .for holding said jaws loosely against theside of the tube and permitting a limited radial movement of said jaws,a spring urging .said jaws toward said collar, a wedge on each of saidrivets adapted to ride on said cam faces in a manner to move .said jawoutwardly under the action of said spring and tohold same outwardpositively bymeans of .said cam, all of said jaws being nonrotatablewith relation to .said core, a slidable collar .attached to said corehaving a reducedendportion equalin diameter to said core and upon whichone end of said jaws canoverlap, said .reduced collar portion havingcircumferential keyhole slots formed therein one for each jaw, eachoverlapping jaw portion .having a rivet on its inner side whose headextends into said collar keyhole slot, a pin passing through said collarand core normally `permitting a slidable movement between these parts'limiting the travel of the double head rivets to the'narrow portions oftheir respective slots, said pin when withdrawn permitting a rotarymovement of said collar and also a slidable movement thereof wherebysaid double headed rivets can move to the enlarged portion of theirrespective slots and permit the separation of said jaws and core.

FRANK E. LANGDGN.

